Structural and Magnetocaloric Properties of ErFe 2 . 4 Al 0 . 6 Compound

Walha, Siwar; Jemmali, M.; Skini, R.; Noël, H.; Dhahri, E.; Hassen, R. Ben; Hlil, E.K.

doi:10.1007/s10948-014-2566-4

Cited by 8 publications

(3 citation statements)

References 35 publications

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“…Intermetallic single crystals of compositions, Er 6 Fe 1 7.6 6 Al 5.34 C 0.65 [38], GdFe 0.37 Ge 2 , GdFe 0.27 Ge 2 [39], ErFe 2.4 Al 0.6 [40] and polycrystalline SmNi 2 [41], SmNi 5 [42], Gd 2 Fe 17-x Cu x [43], Nd 2 Fe 17 -x Co x [44], Er 6 Fe 23-x Al x [45], SmNi 2 Fe [46], SmNi 3-…”

Section: Synthesis By Arc Furnacementioning

confidence: 99%

Polycrystalline Powder Synthesis Methods

Jemmali¹,

Marzougui²,

Smida³

et al. 2022

Crystallization and Applications

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The synthesis of polycrystalline powder is a key step for materials sciences. In this chapter, we present the well-known methods of preparation of powders such as: solid-state reaction, sol–gel, hydrothermal, combustion, co-precipitation. Moreover, synthesis methods by arc furnace, by heating in a “high frequency” induction furnace and by high energy grinding are presented. The obtained powders could be defined by their purity, gain size, crystallinity, and morphology, which are influenced by the synthesis method. In addition, each method is dependent on some parameters like pH, concentration and temperature.

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Section: Synthesis By Arc Furnacementioning

confidence: 99%

Polycrystalline Powder Synthesis Methods

Jemmali¹,

Marzougui²,

Smida³

et al. 2022

Crystallization and Applications

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“…When Fe is substituted by non-magnetic Al, Fe-Fe interactions become weaker, leading to a Curie temperature decrease and a tendency magnetic disorder. According to the dilution law [26], when iron atoms are substituted by aluminum atoms, the magnetization of the sublattice decreases and, consequently, the molecular magnetic moment of the compound increases because the magnetization of the erbium sublattice in Er 6 Fe 23 is larger than the iron sublattice. This decrease of Curie temperature is comparable with a system having a same type of structure (Th 6 Mn 23 ), in the magnetic properties of Gd 6 (Mn 1−x Fe x ) 23 alloys (x < 0.2) [27], the substitution of Mn by Fe leads to a decrease of the T C down to 175 K for x = 0.2 [27][28][29][30][31].…”

Section: Magnetic Propertiesmentioning

confidence: 99%

Effect of Al Substitution on Structural, Magnetic, and Magnetocaloric Properties of Er6Fe23−xAlx (x = 0 and 3) Intermetallic Compounds

et al. 2017

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Abstract:The structural, magnetic, and magnetocaloric properties of Er 6 Fe 23−x Al x (x = 0 and 3) intermetallic compounds have been studied systematically. Samples were prepared using the arc furnace by annealing at 1073 K for one week. Rietveld analysis of XRD shows the formation of pure crystalline phase with cubic Fm-3m structure. Refinement results show that the unit cell volume decreases with increasing Al content. The Curie temperature Tc of the prepared samples was found to be strongly dependent on the aluminum content. This reduces magnetization and the ferrimagnetic phase transition temperature (Tc) from 481 K (for x = 0) to 380 K (for x = 3), is due to the substitution of magnetic element (Fe) by non-magnetic atoms (Al). With the increase of the Al content, a decrease in the values of magnetic entropy is observed. The magnitude of the isothermal magnetic entropy (|∆SM|) at the Tc decreases from 1.8 J/kg·K for x = 0 to 0.58 J/kg·K for x = 3 for a field change 14 kOe. Respectively, the relative cooling power (RCP) decreases with increasing Al content reaching 42 Jkg −1 for x = 0 to 28 Jkg −1 for x = 3.

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“…The study of the structural properties of intermetallic compounds [11][12][13][14][15][16][17][18][19][20] shows abundant structural versatility shown by the large number of different phases, such as Zintl phase and the Laves phase. In the last decade, interest in Laves phases (RM 2 ; R: rare earth and M: metal transition) has grown significantly from practical.…”

Section: Introductionmentioning

confidence: 99%

Magnetocaloric Effect in SmNi2 Compound

et al. 2019

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The structure and magnetocaloric properties of SmNi 2 intermetallic material has been studied by X-ray diffraction and magnetic measurements. Rietveld refinements and energy dispersive X-ray spectroscopy detector show that the SmNi 2 intermetallic is single phase. This intermetallic adopts the MgCu 2 structure type of cubic Laves phase (space group Fd3m) and stabilizes without vacancy in Sm site. The magnetic properties and the entropy change have been investigated by the magnetic measurements. The compound obeys to the second-order magnetic phase transition. The Curie temperature of SmNi 2 is determined by the minima of dM/dT. The magnetocaloric effect has been estimated using two different approaches, the thermodynamic Maxwell's relation and the Landau theory. These studies are discussed in terms of magnetocaloric effect (MCE). The maximum value of the magnetic entropy (ΔS M) is equal to 1.82 J/kg K and the relative cooling power for SmNi 2 is equal to 23.5 J/kg. Besides, the MCE analysis proves a contribution of the magnetoelastic coupling to the entropy change.

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Structural and Magnetocaloric Properties of ErFe 2 . 4 Al 0 . 6 Compound

Abstract: International audienc

Cited by 8 publications

References 35 publications

Polycrystalline Powder Synthesis Methods

Polycrystalline Powder Synthesis Methods

Effect of Al Substitution on Structural, Magnetic, and Magnetocaloric Properties of Er6Fe23−xAlx (x = 0 and 3) Intermetallic Compounds

Magnetocaloric Effect in SmNi2 Compound

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